@Async的用法

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属性Bean: ``` @Configuration public class ContactsExecutor {

@Value("${contacts.thread.core-pool}")
private int corePoolSize;

@Value("${contacts.thread.max-pool}")
private int maxPoolSize;

@Value("${contacts.queue.capacity}")
private int queueCapacity;

@Value("${contacts.thread.timeout}")
private int threadTimeout;

@Bean
@Qualifier("contactsExecutor")
public ThreadPoolTaskExecutor threadPoolTaskExecutor() {
    ThreadPoolTaskExecutor threadPoolTaskExecutor = new ThreadPoolTaskExecutor();
    threadPoolTaskExecutor.setCorePoolSize(corePoolSize);
    threadPoolTaskExecutor.setMaxPoolSize(maxPoolSize);
    threadPoolTaskExecutor.setQueueCapacity(queueCapacity);
    threadPoolTaskExecutor.setKeepAliveSeconds(threadTimeout);

    return threadPoolTaskExecutor;
}

} ```

线程配置文件:

```

thread pool and queue size for processing contacts data

contacts.thread.timeout=2 contacts.thread.core-pool=10 contacts.thread.max-pool=25 contacts.queue.capacity=25

```

主程序入口添加注释： ``` @EnableAsync @ComponentScan @EnableAutoConfiguration public class Application { ....... }

```

调用类: @Async("mainExecutor") public void methodA(){}

Configure queue and thread pool for async execution